Research Of ATP Coarse Track Cell In Free Space Laser Communication System

Free-space optical communication is a new technique of communication. It has many advantages, such as high bandwidth, high code rate, high confidentiality, and low power consumption. It becomes the new direction of space communication. Its application prospect will be fine. Each country has paid attention to this subject. However, narrow laser beam lead to many challenges of beam alignment techniques. So the study on Acquisition, Tracking, Pointing-ATP is important.This thesis studies on coarse tracking receiving system. It introduces principles of ATP, and analysis on composite axial controlling system structures and error-field matching. Especially studying on controlling of the basic shaft of coarse tracking system—coarse tracking, it makes accurate acquisition and high accurate tracking come true. It discusses the selection of the coarse tracking receiving element—CCD and the hardware composition, and the processing of receiving signal. It sets coarse tracking elements math model and carries emulate experiments. It discusses the effect of the atmosphere to the tracking, mostly the sky background. Through the analysis and the experiments, bring a method to rejection the laser, and do the space transfer experiments.